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A calender is a series of hard pressure rollers used to finish or smooth a sheet of material such as paper, textiles, rubber, or plastics. Calender rolls are also used to form some types of plastic films and to apply coatings. [1] Some calender rolls are heated or cooled as needed. [2] Calenders are sometimes misspelled calendars.
The actual process of extrusion coating involves extruding resin from a slot die at temperatures up to 320°C directly onto the moving web which may then passed through a nip consisting of a rubber covered pressure roller and a chrome plated cooling roll. The latter cools the molten film back into the solid state and also imparts the desired ...
The biggest advantage with the hose pumps over the roller pumps is the high operating pressure of up to 16 bar. With rollers, max pressure can arrive up to 12 bar (170 psi) without any problem. If the high operating pressure is not required, a tubing pump is a better option than a hose pump if the pumped medium is not abrasive.
Here's how to do it: Place a foam roller under your body — avoiding any of the areas mentioned below! — and slowly roll your body back and forth. If you're rolling your back, you'll use your ...
One roller is usually a hollow tube (heat roller) and the other is a rubber-backed roller (pressure roller). A radiant heat lamp is suspended in the center of the hollow tube, and its infrared energy uniformly heats the roller from the inside. For proper bonding of the toner, the fuser roller must be uniformly hot.
In 1886, Schlicht & Field of Rochester, N.Y., introduced the Rapid Roller Damp-Leaf Copier, a roller copier, which used pressure supplied by rollers to copy letters onto a roll of dampened paper. After copies were pressed onto the paper, the paper entered the cabinet under the copier, where it dried on a large roller.
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The slice opening and water pressure together determine the amount and velocity of whitewater flow through the slice. The slice usually has some form of adjustment mechanism to even out the paper weight profile across the machine (CD profile), although a newer method is to inject water into the whitewater across the headbox slice area, thereby ...
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